@article{ref1,
title="Rock anchor system for securing failing wall",
journal="Transportation engineering journal of the American Society of Civil Engineers",
year="1979",
author="Nicholson, PJ",
volume="105",
number="2",
pages="199-209",
abstract="A description of the design, installation, and testing of 132 permanent rock anchors used by the Pennsylvania Department of Transportation to save a failing concrete retaining wall. Design parameters of the three level rock tieback system are examined along with installation techniques and special corrosion protection used to make the system permanent. Grouting techniques and grout mixes are examined. Recommendations are made against the use of admixtures in the grout. Load testing and load cell monitoring of the anchors show some initial movements but achieve stability in a short period of time.<p />",
language="",
issn="0569-7891",
doi="",
url="http://dx.doi.org/"
}